The world has lost an incredible thinker and doer. I have lost an amazing friend. A void exists where before it was filled with David's optimism, humour and joy.
World Glacier Monitoring Service
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Must-See Video: Top Scientists Speak Out On Arctic Emergency
Man-made greenhouse gas emissions have become the dominant cause of melting in glaciers from the Alps to the Andes that is raising world sea levels, a new study finds.
